Re: [ESPResSo-users] Lattice Boltzmann Boundaries

[Kai Szuttor]

Hi,

you can try to use LB boundaries with velocity boundary conditions but I have 
not tested this myself.

Best,

Kai

> Am 04.07.2019 um 16:02 schrieb Martin Kaiser <address@hidden>:
> 
> Hi everybody,
> 
> I have a question regarding the box boundaries in a Lattice Boltzmann 
> Simulation. The situation is as follows:
> 
> I took the code from the LBM  Tutorial Part 1, where there is a square tube 
> with a sphere in the centre. The flow is created just as in the sample code. 
> My problem is that, for what I need to do, I need to change the parameters so 
> that I see vortices behind the sphere (increasing Reynolds number). Due to 
> the periodic boundary conditions on the open ends of the tube, the “tail” 
> that is created behind the sphere re-enters the simulation box from the other 
> side and thus perturbing my system in an unwanted way.
> 
> Is there a smart way in ESPRESSO to bypass this, creating an ,sort of, inlet 
> and outflow boundary conditions on the open ends of the tube?
> 
> I hope that my issue is clear, all the best,
> Martin